Result of putting lots of dough in the kitty? (3,3)
I believe the answer is:
fat cat
'result of putting lots' is the definition.
The definition suggests a singular noun which matches the answer.
'dough in the kitty?' is the wordplay.
'dough in' becomes 'fat' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'the kitty?' becomes 'cat' (kitty is a kind of cat).
'fat'+'cat'='FAT CAT'
'of' acts as a link.
(Other definitions for fat cat that I've seen before include "Banking executive maybe" , "Wealthy person like obese feline" , "Wealthy person like obese beline" , "Excessively wealthy person" , "Moneybags as an obese feline" .)